The space shuttle Endeavour lifted off on its last mission Monday morning, NASA said.

The shuttle's mission is commanded by Mark Kelly. His wife, U.S. Rep. Gabrielle Giffords, D-Arizona, arrived safely at the Kennedy Space Center Sunday, NASA said, four months after being shot in the head during an assassination attempt at a public event in Tucson, Arizona.

After initial treatment in Arizona, Giffords has been undergoing rehabilitation at the TIRR Memorial Hermann center in Houston.

Photos of the shuttle and NASA's launch countdown clock were posted on her Facebook page Monday morning.

Giffords, along with President Barack Obama, was in Florida on April 29, when Endeavour was originally slated to launch. That liftoff was scrubbed because of a problem with a heater aboard the shuttle.

The shuttle program is dead, and we have no vehicle to get into orbit anymore. That's a shame I think, but Russia will still launch to service the ISS for as long as THAT lasts. So, the only current NASA program I am looking forward to now is the science returning from the New Horizon craft to photo Pluto and Charon in 4 more years. Should return some stunning photos of the dwarf planet and moons.

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